why is vectorA-vectorB=(A*A)+(B*B)-2AB cos θ?But vectorA-vectorB=(A*A)+(B*B)+2AB cos θ.Wheat is the reason for the change in equation?

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why is vectorA-vectorB=(AA)+(BB)-2AB cos θ?But vectorA-vectorB=(AA)+(BB)+2AB cos θ.Wheat is the reason for the change in equation?

why is vectorA-vectorB=(AA)+(BB)-2AB cosθ?But vectorA-vectorB=(AA)+(BB)+2AB cosθ.Wheat is the reason for the change in equation?

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why is vectorA-vectorB=(A*A)+(B*B)-2AB cos θ?But vectorA-vectorB=(A*A)+(B*B)+2AB cos θ.Wheat is the reason for the change in equation?

why is vectorA-vectorB=(A*A)+(B*B)-2AB cosθ?But vectorA-vectorB=(A*A)+(B*B)+2AB cosθ.Wheat is the reason for the change in equation?

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why is vectorA-vectorB=(AA)+(BB)-2AB cos θ?But vectorA-vectorB=(AA)+(BB)+2AB cos θ.Wheat is the reason for the change in equation?

why is vectorA-vectorB=(AA)+(BB)-2AB cosθ?But vectorA-vectorB=(AA)+(BB)+2AB cosθ.Wheat is the reason for the change in equation?